You are here: 

HDD Machine common cases and solutions 11

Matters needing attention in sand crossing construction

In the sand crossing construction, there is often a lack of true and detailed geological data! Therefore, the mud performance indicators cannot be implemented in full accordance with the indicators determined by the laboratory; during the construction process, the drilling cuttings content in the re-mortar should be used as the mud indicator whether it is qualified The important basis is that if there is a low content of drill cuttings in the return slurry, the main indicators such as the viscosity and static shear force of the mud should be increased until the content of the drill cuttings in the return slurry is equivalent to the theoretical value! Secondly, due to the above-mentioned groundwater The adverse effect of the sand layer

During the crossing construction, the mud is most affected by the drilling speed! The faster the drilling speed, the more drilling cuttings produced in the same time, and the more groundwater entering the mud, the more obvious the dilution of the mud! Therefore, When drilling in the sand layer, the mud displacement and drilling speed of each level of reaming should be designed; in the whole construction process, the reaming speed cannot be higher than the design value, and it is best to keep the same speed for drilling. Keep the mud in the hole relatively uniform!

Share This Story,Choose Your Platform!

LEAVE A MESSAGE

IF THERE IS A NEED AND PLEASE SEND US AN EMAIL OR CALL